I have found that my blood sugar levels are affected by any strong emotion and not just stress. Once I found that one of my experiments had worked just before lunch and I was VERY happy and excited. At the time I was testing before and after meals and I found that I had a huge glucose spike when I tested myself about 15 minutes later. I am a very reactive person, and decided that I would either have to live with the spikes or start practicing Zen meditation...